LONDON, ENGLAND - JUNE 02: Prince Phillip, the Duke of Edinburgh attends The Rifles' Sounding Retreat at Horse Guards Parade on June 2, 2016 in London, England. (Photo by Stuart C. Wilson/Getty Images)
LONDON, ENGLAND - JUNE 02: Prince Phillip, the Duke of Edinburgh attends The Rifles' Sounding Retreat at Horse Guards Parade on June 2, 2016 in London, England. (Photo by Stuart C. Wilson/Getty Images)